Collaborative Research: West Antarctic Ice Sheet stability, Alpine Glaciation, and Climate Variability: a Terrestrial Perspective from Cosmogenic-nuclide Dating in McMurdo Sound

合作研究：南极西部冰盖稳定性、高山冰川作用和气候变化：麦克默多湾宇宙成因核素测年的陆地视角

• 批准号: 1246207
• 负责人: Joerg Schaefer
• 金额: $ 35万
• 依托单位: Columbia University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-09-15 至 2017-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1246207&HistoricalAwards=false
• 关键词: Collaborative; Research; West; Antarctic; Ice

Intellectual Merit: The PIs propose to complement the ANDRILL marine record with a terrestrial project that will provide chronological control for past fluctuations of the West Antarctic Ice Sheet (WAIS) and alpine glaciers in McMurdo Sound. The project will develop high-resolution maps of drifts deposited from grounded marine-based ice and alpine glaciers on islands and peninsulas in McMurdo Sound. In addition, the PIs will acquire multi-clast/multi-nuclide cosmogenic analyses of these mapped drift sheets and alpine moraines and use regional climate modeling to shed light on the range of possible environmental conditions in the McMurdo region during periods of grounded ice expansion and recession. The PIs will make use of geological records for ice sheet and alpine glacier fluctuations preserved on the flanks of Mount Discovery, Black Island, and Brown Peninsula. Drifts deposited from grounded, marine-based ice will yield spatial constraints for former advances and retreats of the WAIS. Moraines from alpine glaciers, hypothesized to be of interglacial origin, could yield a first-order record of hydrologic change in the region. Synthesizing the field data, the team proposes to improve the resolution of existing regional-scale climate models for the Ross Embayment. The overall approach and anticipated results will provide the first steps towards linking the marine and terrestrial records in this critical sector of Antarctica.Broader impacts: Results from the proposed work will be integrated with outreach programs at Boston University, Columbia University, and Worcester State University. The team will actively collaborate with the American Museum of Natural History to feature this project prominently in museum outreach. The team will also include a PolarTREC teacher as a member of the research team. The geomorphological results will be presented in 3D at Boston University?s Antarctic Digital Image Analyses Lab. The research will form the basis of a PhD dissertation at Boston University.

智力优势：PI 提议通过一个陆地项目来补充 ANDRILL 海洋记录，该项目将为西南极冰盖 (WAIS) 和麦克默多湾高山冰川过去的波动提供按时间顺序的控制。该项目将绘制麦克默多海峡岛屿和半岛上陆地海洋冰和高山冰川沉积物的高分辨率地图。此外，PI还将对这些绘制的漂移片和高山冰碛进行多碎屑/多核素宇宙成因分析，并使用区域气候模型来揭示麦克默多地区在接地冰膨胀和冰膨胀期间可能出现的环境条件范围。经济衰退。 PI 将利用发现山、黑岛和布朗半岛侧翼保存的冰盖和高山冰川波动的地质记录。地面海洋冰沉积的漂移将为 WAIS 的前进和后退产生空间限制。高山冰川的冰碛被假设为间冰期起源，可以产生该地区水文变化的一级记录。通过综合现场数据，该团队建议提高罗斯海湾现有区域尺度气候模型的分辨率。总体方法和预期结果将为连接南极洲这一关键区域的海洋和陆地记录迈出第一步。 更广泛的影响：拟议工作的结果将与波士顿大学、哥伦比亚大学和伍斯特州立大学的外展计划相结合。该团队将积极与美国自然历史博物馆合作，在博物馆外展中突出展示该项目。该团队还将包括一名 PolarTREC 老师作为研究团队的成员。地貌结果将在波士顿大学南极数字图像分析实验室以 3D 形式呈现。该研究将构成波士顿大学博士论文的基础。